while meeting the demands and staying in compliance with the restrictions of Yara. T e result was an air-conditioning unit diff erent from
standard solutions in terms of temperatures and allowable pressure drops. Bronswerk was more than up to the challenges of debottlenecking and revamping existing installations to improve the capacity within the actual plot size limits while keeping the original equipment intact as much as possible.
PROCESS OPTIMISATION The proposed solution was especially designed to meet the critical design demands (to cool back-washed ambient air of a temperature of 13°C (100% RH) to a temperature of 2°C (100% RH). First, the unit needed to be able to cool down to 2°C without the risk of ice formation. Bear in mind that standard units are only able to cool down to 7°C before ice formation starts. Secondly, the unit needed to be able to withdraw 2m3 per hour of moist from the air for the air cooling to be effi cient. The natural working fl uid used for this process was R717 (ammonia). To use this medium to cool down the air and to extract the moisture, an in-between circuit was designed, consisting of a compressor, heat exchangers and ducted bundles, as shown in the illustration. There were only a few concerns. Firstly, because of applying two bundles in an existing channel the resulting pressure drop of the installation had to be compensated in some way. For this reason Bronswerk provided the new set up with two new fans, eliminating any kind of pressure loss in the process. Furthermore, the system will be not in operation throughout the whole year. This will mainly occur during winter times when the air has less humid. For this reason a by-pass system was applied, enabling Yara to shut off the unit thereby preventing unnecessary usage. Last but not least, droplets needed to be separated from the cooled down air. Therefore two demisters were applied on both sides of the bundles to extract the water from the air.
THE PROJECT STATUS At the moment Bronswerk is fi nalising the remaining activities for this project, which will be in full operation at the end of 2016. The fi rst major results are expected in spring 2017 but the forecasts are very positive. The research, combined with a suitable process solution, engineering and hardware supply, make this project one of a kind and underline both companies’ ambitions to be role models within the industry when it comes to process optimisation and sustainability. ■
For more information ✔ at
www.engineerlive.com/process
Femke Schaefer is with Bronswerk.
www.bronswerk.com
For more information ✔ at
www.engineerlive.com/process
Energy generation 4.0
The Master Energy Control system provides the high level of efficiency as well as perfect integration in building and production technology.
Rely on experienced experts and forward-looking technology for more efficiency and economy. The efficient use of energy is a decisive competitive factor. Whether for industry, business, private or public facilities, or for energy supply companies - we support you in implementing the optimum solution for you. Our modular range of products extends from heat generation in industrial boiler systems, large-scale solar plants and heat pumps, right up to combined heat and power systems and ORC plants. High quality and comprehensive service from Bosch en- sure that your system operates economically, sustainably and over a long period of time.
www.bosch-industrial.com
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